Protomycopsis patelii Pavgi and Thirumalachar causing angular black spot of Phaseolus mungo L. and P. radiatus L., and Protomycopsis thirumalacharii Pavgi causing purple leaf spot of Sesbania grandiflora Pers. are perpetuated from one season to another through desiccated but viable, heat-resistant chlamydospores in the host residue and those developed in vitro in the soil. The heat-resistant mycelium is later consumed in forming the resting chlamydospores in the soil, thus adding another dimension to the initial soil-borne inoculum potential of the disease.